Paper interfolding machine



May 12, 1931. L. A. STRAUBEL PAPER INTERFOLDING MACHINE Filed Jan. 20, 4 Sheets-Sheet. l

May 12, 1931'.

L. A. STRAUBEL PAPER INTERFOLDING MACHINE \Filed Jan. 20.

1930 4 Sheets-Sheet. 2

I Qirlve ii 257" .ZOIIID JV. 517 6111 $6 Z a s e May 12, 1931. L. A. STRAUBEL PAPER INTERFOLDING MACHINE Filed Jan. 20. 1930 4 Sheets-Sheet. 5

Z I6 0 0 FM 5 May 12, 1931. A. STRAUBEL PAPER INTERFOLDING mamas Filed Jan. 20. 1950 4 Sheets-Sheet, 4

Patented May 12, 1931 Paras LOUIS A. STRAUBEL, OF GREEN BAY, WISCONSIN FAPER INTERFOLDING MACHINE Application filed January 20, 1930. Serial No; 422,931.

My invention relates to improvements in paper interfolding machines and more particularly to the type of machines employed in producing packages of material such as toilet paper and paper toweling composed of two leafunits or'books, the leaves being interfolded with the leaves of adjacent units or books. 7

An object, generally, of the invention is 10 to simplify the construction and to increase the capacity of machines of the kind described. v

The invention contemplates advancing two sheets of paper in juxtaposed relation,

each of said-sheets being partially severed along lines midway between the partially severedportion of the adjacent sheet and then feeding such partially severed juxtaposed sheets between a pair of oscillating rollers; The period of oscillation of the rollers is such that each forward movement completely severs one of the advancing sheets and intermittentlymoves two completely severed overlapping sections for-, I wardly to a point where the forward end of the most advanced section is held stationary by the folding mechanism. .The backward movement of the oscillating rollers returns the rearmost of the two overlapping severed portions and closes the gap between it and the following portion of the sheet from which it was originally severed. The advancing end of the adjacent sheet, at the instant of the closing of the gap, is engaged by the oscillating rollers and this sheet, as a result, is in turn severedby the next advance movement of the oscillating rollers, the rollers operating first upon one sheet and then upon the other to completely sever them in turn. The oscillatory motion of the rollers causes the two overlapping com pletely severed portions to intermittently advance more rapidly than the unsevered portions and then the rearmost of the two severed portions to be retarded until the sheet from which it is severed overtakes it.

In making the folds alternately on top and bottom, the folding devicerequires the forward movement of the sheets in an intermittent manner as it folds each sheet, and

theoscillating rolls are timed toprovide this V movement so as to avoid slack at points between the oscillating rolls and the point where the sheets are held stationary by the folding mechanism. Another object of the invention is the provision of improved means for varying the speed with which the workmaterial is advanced and thereby preventing slack in the sheets of work material which would otherwise result from" the sheetsbeing held stationary'by the folding mechanism. v 1

Still another object of the invention is the provision of an interfolding machine operable to advance twosheets of material in overlapped relation, the sheets being broken and parted while they are in overlapped re-- lation and the opening again closed while 7 the sheets aremoving. 1 I A more-particular object is the provision of improved folding mechanism in' such machines. 1 i

Still another object is the provision of i novel means for completing the separation of strips of material already partially severed.

A still further object is the provision'of a machine of the kind described whichis compact, durable, reliable, convenient and satisfactory for its intended purpose.

In the drawings, wherein like reference characters indicate like or corresponding parts,

Fig; 1 is'a plan view of a machine embodying my invention;

Fig. 2 is a side elevational view of the 7 machine shown in Fig. 1;

Fig. 3 is an elevational view of the discharge end of the machine;

Fig. 4 is a side elevation-and partial sectional view along the line 4t of Fig. 1;

Fig. 5 is a sectional view along the line 5-5 of Fig. 2;

line 7 of rial comprising two rollers of paper 19 journaled, one upon an upper pair of brackets 15. The sheets of paper comprising the rolls 19 are each advanced partlywarounch andbetween a felt covered feed roll 21 and a bed roll 20. The bed rolls 20 are each provided with longitudinal recesses 18 for the reception of cutting knives 17. The knives 17 are mounted upon a perforating or cutting roll 22 between which and the feed rolls 20 the sheets of paper pass after leaving the felt covered feed rolls 21. The longitudinal recesses-18 and the cutting knives 17 are so arranged andof such a length as to only partially sever the sheets of paper advancing between the rolls 20'and 22. 'The sheets of material, upon leaving the rolls-20 in their partially severed condition, meet and are advanced in juxtaposed relation between a pair of felt covered rolls numbered 23 and 24; The knife 17 and therecess 18 of the upper rollers 22 and 20, respectively, are so timed in their relation to the knife 17 and the recess 18 on the rollers 22 and-20, respectively, that the partially severed portions of the upper sheet are positioned midway between the partially severed portions of the underlying sheet. The two sheets of material, upon passing between the'rollers 23 and 24 are-advanced between upper guide rollers 25 and 27 arranged in pairs with lower guide roll 26 and 28,respectively. The upper guide rollers 25 and 2'7 are spaced apart from the correspoi'iding lower guide rollers sufficiently that they serve only as guides and supports and are not provided as a positive dri e or feed for the advancing sheets ofpaper. All; of the rollers hereinbefore indicated, are constantly rotating in a direction tending to advance thewwebs' of material, the mechanism for actuating the rollers being, hereinafter more particularly described. I

'lhe br-eaker rollers 29 and 39 are caused to oscillate together in-the plane o'f the advancing sheets of material by mountingthe rollers upon a pair of rocker arms 42. The arms 42 are pivoted about a shaf 46 and their oscillatory.movement is produced by a link 43. The upper ends of the arms 42 are connected by a transversely extending shaft 45, with the mid portion of whichone end of 'the link 43 is pivotally-conne'cted. The other end 0 the link 43 has a cam connection 44 with the drive shaft 12, whereby each .24, the partially cut portion of the same sheet immediately in advance, has not yet entered betweenithe breaker rollers 29 and 30. Each forward oscillatory movement of thebreaker rollers 29 and 30 completely severs the nearest partially cut portiondof the super-imposed sheets of paper advanc ing f therebetween. The upperand lO W'81 sheets are thereby in turn completely severed and the severed portion accelerated and retarded alternately byalternateforvvard and backward movements of the rollers 29 and 30. The lower guide rollers 26 and-28 assist in en. mortin both the artia-ll sev-- ered and the completely severed sections of the two advancing sheets of material." The completely severed portions of the sheets of material are advanced together'in overlapping relation between a pair of angle iron guides 47. After-passing the guides 47 the overlapping severed sections ofmaterial are brought intoengagement with the' folding mechanism by means of which each-cornpletely severed sectionof material is folded at its mid portion incontact with the adjacent'ends of the two completely severed portions of the othersheet, thereby :fori ing each section into a book "of two leaves which interlock with the leaves iof adjacent books, as is best shown in Fig. 8.

The initial contact of the tucker blades 58 with the middle of the severed portions, for'the purpose of folding the same, is at a relatively slow speed-which increases rapidly by reason of theconstructionof the cams 69. The folding operation resulting from the contact ofthe blades 58 with the mate rial requires that -the forward endof the severed portion be retained fixedly in position between the leaves of the previously folded section by the pressure of the adjacent flaps 52, during the folding operation. This folding operation, therefore,-.requires that the rear half of the section being folded be advanced more (rapidly than the main body of the sheet from which it was severed. The forward movement of the oscillating rolls 29 and 30 is so timed as to feed tic section being folded at the proper rate and to permit the folding operation to occur with the advance end of the section held stationary. The accelerated movement of the material occasioned by the oscillating rollers 29 and 30 thereby avoid the necessity i r s 1,804,847

for-any slack being provided in the paper adjacent the folding mechanism. The return oscillatory movement of the rollers 29 and 30 closes the gap between the end of the severed portion and the forward end of the sheet with which it was originally con nected. l I The arrangement of the feed rolls 23 and 24, which take'the overlapped sheets from both the bed rolls 20 and hold the sheets so that the oscillating rolls 29 and 30 do not break the ties connecting the partially severed portions While the sheets are being partially severed and permits the ties to be broken at a point between the feed rolls and the oscillating rolls where the sheets are in overlapped relation, constitutes an important part ofthe' invention. V

A pair of spaced apart angle irons 4:9 are fastened to the frame of the machine by bolts 48. The inwardly extending'legs of the angle irons 49 are spaced apart to. permit the interlocking folded sections of material to be pressed outwardly therebetween in vertical positionfollowing thefolding operation. T helower of the angle-irons 4-9 serves as a support for the'material and the upperv as a guide, as best shown in'Fig. 6.

A drive for the various partsxof the machine is obtained through a' suitable train of gearsmounted upon the various shafts which are journaled in the side frames 10 and 11. Power enters the machine through the belt 14 and the pulley 13, as already described, thereby rotating the main drive shaft 12. A gear 82 is mountedon the'shaft 12 in meshing engagement with a gear 83. The gear 83 is fixedly mounted upon and aetuates theupper shaft 31, upon which the upper bed roll 20 is mounted. Rotation of the upper shaft 31 actuates a gear 86 which meshes with a gear 87 mounted .upon and driving an upper shaft 33 upon which the upper perforating or cutting roll 22 is mounted. The felt covered feed roll 21 is so mounted upon the shaft 32 astocooperatively engage and be actuated by the upper bed "roll 20.' Rotation of the feed roll 21 serves to unwind the paper from the roll '19, causing the material to passvover the'roll 21 and between the roll 21 and the bed roll 20. The gears 86 and 87are of the same diameter and thereby cause. the rolls 20 and 22 to rotate at the same rate. the sheet of material passing between the rolls 20 and 22 is artially severed by the knife 17 along transverse linesspaeed apart a distance equal to the diameter of the rolls 20 and '22.

A relatively large gear "ismounted upon the upper shaft 31 in mesh with a gear 84; of equal vdiameter mounted on a lower shaft 31. The lower shaft 31 carries and rotates the lower bed roll 20 in operative engagement with thelower felt covered As aresult,

feed roll 21 thereby advancingand unwinding the material from the lower paper roll 19 in the same manner as described for the upper roll; The lower shaft 31 carries a gear 88 which meshes with a similar gear fixedly amounted upon and rotatable. with a lower shaft 33. The lower shaft 33 carries the lower perforating or cutting roll 22 in cooperative engagement with the lower bed roll 20.' It is to be noted that both the upper and lower sets of rolls 20 and-22 are thereby rotated at the same rate and serve to par.- tially, sever thezupper and lower advancing sheets of material in exactl the same way, the only difference being t at theknife 1'7 and recess 18 of the upperset of rollers are so positionedthat they partially sever the upper sheet of paper at points exactly midway between. the corresponding partially severed portions of the lower web of materiaL. s a

The felt covered feed rolls 23 and 24,106- tween which the two partially severed portions of material are fed are actuated-by the lower shaft 31 through a gear 90 which meshesiwith a gear 98 mounted for that pur pose on the lower shaft 31. The gear 90 is' mounted on a stud shaft 91 and meshes with a gear 93 fixedly mounted upon the shaft that the upper guide rollers 25 and 27 and the correspondinglower guide rollers 26 and 28 may be rotatedin'the same general direction as theco'rresponding upper feed roll 23 and lower feed roll 241-. The gear 96 meshes with a relatively wide gear 97 suitably mounted on a stud shaft in a position 7 to mesh with gears 99 and 101 mounted; on shafts 37 and 39, respectively. The gear 99 is positioned at asufliciently greater dis tance from theiframe 10 to clear the gear 101 so that there isno operating engagement of the gears 99 and 101. The resultingv rotation ofthe gears 99 and 101 in counterclockwise direction, as observedin Fig." 4, similarly rotates the shafts 37 and 39, thereby causing the guide rolls 26 and 28, mounted thereon, to be rotated in the desired direction. A gear 100 mounted on a shaft 38, meshes with the gear 101 and causes the shaft 38 to rotate the'upper guide roll 27. Similarly, a gear 98 mounted upon a shaft 36 meshes with the gear 99 and causes" the desiredrotation of the upper guide roll 25.

The breaker rolls 29 and 20, journaled upon shafts 40 and 41, "respectively, are subjected to oscillatory-motion by reason of the shaftsbeing journaled in the rocking arms 42 itflld.. .&f6'f10tflst6dili byizanxo'perative connection with. the :gearj97. 2F Eorrthispurpose un. idler-gear 102i; mounted; on a lower-"shaft 55::i'n mesh: with the:-gea1==97 an'd meshesin turir withian ii dler'. gear 104: mounted on :the lsh'afti .46. The; gear 104: meshes with. a gear! 100:. which .is? fixedly mounted upon. the :1 shaft; .41 and thereby causes the shaft and the-slower breaker'roll to rotate. -in .clockwise. .direction, .as observed in Fig.6. TheLgear. 100 meshes with a gear 105, similarly IIlOL1Dt-Bd-30n"tl16l shaft 40 to cause .the hbreaker -:roll. 1 29; to. :rotate in counterclockwise dilBChlOIl,'i las aobserved in Fig; 6. Since the rockingsarmsidQare pivoted about the shaft 46rtheir oscillation carries 'with them the rollers 29 ;and 80rand their corresponding gears i105 'anda100, maintaining 1 the gears: in! mesh '-1 with" each.- other and tlie gear '100nin meshing relation with the gear 104, thereby permitting simultane ous rotation and oscillationvof" the rollers 29 and 30.'i The:trainsrof-gears are all sonarrangedand constructed thatceach .of the rollers operated thereby; perform their part in advancing the superimposedrsheets :of material at the same rate. except for the oscillating rollers' 29 and" 39: Whicln :bywreason-of their oscillation -completely: sever thesheets of material in: turn-,as -herebefore described.

Taking up the foldingmechanismwof the machine, pairof vertically aligned; short pressure flaps-50, extending transversely through the machineyare mounted upon cor responding rocker shafts" 52. '.As observed iii Fig. 6, the upper of the flaps 1s pressing againstthe upperportion ofnthe folded work material while the lower IS-1011i of engagement with the Work during'rthe folding oft-he material adjacent theloweraflapa The edge "of the inwardly projecting legs 'of'the angle irons 49 are cutback to permitlthe flaps 50 to be rotated into'itheir vertical position. g

' A pair of verticallyaligned=transversely extending rocker shafts ='53, -journaled in the; side frames 10 and 11, each carry an arm 51. The arm 51 on -the upper of the shafts 53-is positionedadjacent-to and outside of the'franie lOf 'Thearni 51,'mounted on the lower of the shafts- 53,-is positioned outside of and adjacent to" the side'frame 11. Each of the arms 51 "carries a transversely extending pressure" flap" 51a. The flaps 51a, in turn engage the severed sections of .tl1e.material in" the mid portion 51a-isshown in the position ittakes =following movement of the arm: 5Ov intover'tical position. The-pressure flaps. 51a are operable in turn: :to successively =.-hold l the ibooks ofrelatively thin material such as tissueand other light weight paper in their folded position.

In Fig. 6, a completely severed portion of the lower sheetis shown as being folded at its mid portion by contact therewith of a tucker blade 58 which extends transversely through the machine and through an opening79 in the side-frame '11 of the machine. The projecting end of the tucker blade 58 is-mounted on a bar 57 carried by an arm 56. The arm 56 is mounted on the lower of the shafts 55 and is operatively connected with a cam disk 78 in a manner hereinafter more particularly described. A 1 similar tucker arm 56 is mounted on the upper shaft '55, as best shown in Fig. at, and has suitably fastened in its lower end a bar 57 carrying. a tucker blade 58 which projects through an aperture 7 9 in the side frame 10 of'the machine. 'The upper arm 56 is of sufficient length to extend across and contact with the under side of the work inaterialso as to fold the severed portion of the uppersheet of material at its mid point in the same way as is shown in Fig. 6 for the lower sheet of material. The two blades 58 are alternately operable to fold the material by traveling back and forth in intersecting circular paths.

The rocker arms 52 and 58, carrying the pressure flaps 50 and 51a and the tucker arms 56 carrying the upper andlower tucker blades 58 are operatively connected with the constantly rotating gear mechanism here- .inbefore described so as to alternately fold and pressthe'folded work into position by means of mechanism properly timed for that purpose. For this purpose each of the shafts'31 has a cam disk 69 mounted thereon and each of the disks is rotated by its shaft '31 to actuate a'system of arms and links in proper sequence to produce the desired movement of the folding and pressing mechanism. The lower shaft 31 has its cam disk 69 mounted on the outside of the side frame 11 "and operatively. connected with the adjacent arm 56. The rocking of the .arm 56 moves the blade 58 downwardly to fold the material and also moves the corresponding lower pressure flap '50 and blade 51a. The upper of the shafts 31 has its cam d1sk 69 mounted on the outside of and adjacent to the side frame 10 so as to ac tuate the set of arms and links which correspondingly move the tucker. blade 58 and pressurefiaps 50 and 51 operating on the upper folded portions of'the material.

As observed in Fig. 2 the cam disk 69 has a substantial portion cut away and is :so pos1t1oned that its periphery contacts with a roller'68 suitably mounted on a rock- -er arm 67. The rocker arm 67 is'rotatable about a pivot 70 and-is constantly urged in: counter. clockwise direction. by a compression. spring 74. A plunger rod 71 is connected with the rocker arm 67 by means of a .pivot'ed'yoke connection 72, the arm 71 extending through the'spring 74: and

projecting through an aperture provided for that purpose in an outstanding leg of an angle iron 75. The angle iron 75 provides an abutment :for the compression spring 74: so that the roller 68 is constantly held by the pressure of the spring 7 4: in concular portion of the periphery of the cam disk 69, the tucker blade 58 is inits lowermost position, as shownin Fig. 2 and Fig. 6. g It .is obvious that this tucker blade 58 remains in its lowermost position, during that portion of the rotation of the disk 69 wherein the roller 68 is. in contact with the" curved portion of the periphery ofthedisk. As the disk 69 is rotated by the shaft 31 in clockwise direction the roller 68 will-be broughtinto contact with the cut away cam face 7 8. The spring 74 will cause the arms 67 and 56'to, rotate in counterclockwise-di- IGCtlOII' as a result and thereby move the tucker blade'58 out of contact with the work and into a position corresponding "to' and immediately above the other of the tucker blades 58, asshownin Fig. 6. I a

The tucker arm 56 is fixedly mounted on the rocker shaft 55, and inrotating, as above described, carries with it arms 62 and 68 each having upwardly projecting end portions providing cam surfaces 64 and 65,.respectively. The lower rocker shaft 52-has a rocker arm fixedly mountedthereon with a roller 110 positioned to engage the cam papenhaving novel means foralternately surface 64: of the arm 62. Similarly, .the

' rocker shaft 53is providedwith a rocker arm 61 having. a roller 111 positioned to operatively engage'the Icamsurface of the arm 63. Compression springs 77 are pro-.

vided to hold the arms 60 and 61 with their rollers 110 :and' 11-1 in contact with the cam surfaces 64'and 65, respectively. Each of the rocker arms 60 and 6 1 are providedwith a plunger rod? 6 operatively connected therewith by means of a yoke, (not shown), sim- A ilarto the yoke-connection 7 2 with the .arm

l 67. Angle irons 73 provide abutments for thesprings 77 and have their outstanding.

legs apertured to slidably receive the free ends of the arms 76.. As the arm 56 is ro- 'tated fin counterclockwise direction, as observed in 2, following the engagement of the roller 68 with the cam surface 78 of the disk 69, the arms 62 and 63 will be simi- 7 "larly rotated, bringing the rollers 110 and 111 into contact with the lower cut away portion of the cam surfaces 64 and 65, respe'c- V tively thereby causing the corresponding pressure flaps 50 and 51wto be rotated into contact with the work and maintainingthe adjacent folded portions of the sheets of flimsy material in their vertical position.

mounted on frame10 is so positioned relative to that shown on frame 11 that the two sets of operating mechanism are symmetrical about a horizontal plane between the two sheets of juxtaposed material. The operation of the two sets of mechanism is identical and differs only in the time of operation. This difference in .timingis accomplished by so mounting the cam disk 69 on the upper shaft .31 as to position the cam face 78 in contact with its roller 68 when the cam face 78 of the disk 69 mounted on the lower shaft 31 is diametricallyopposite to its roller 68.

By mounting the actuating arms 56, 62 and 63 on the outside of the frames10 and 11 with one set aboveand the other below the work and having the pressure flaps 51a and tucker blades 58 suitably mounted on arms on the exterior of the frames, the desired oscillatory movement of the oppositely operating plates and flaps is accomplished ,without any interference and constitutes an important feature of the invention.

Thus it will be seen that I have provided animproved interfolding machine operable for interfoldin'gf two juxtaposed sheets of severing such sheets of paper and novel folding mechanism wherein the twosheets of paper are alternately folded upwardly and downwardly and held in position alternate" .ly by pressure flapshaving their paths intersecting, the mechanism being so constructed that eachmembermoves to perform its function without interfering with: the movement of corresponding mechanism which crosses its path. 1 I Hav ng thusdescr bed "my invention, f1t is obvious that various immaterial modificationsmay be made inthey same without do parting from the spirit of my invention;

hence, Iydo not wishito be understood as limiting myself to the exact form, construction, arrangement, and combination of parts herein described and shown, or uses mentioned What'I claim as new and desire to secure by Letters Patent is:

.1. Inan interfolding machine, the combination. of means for advancing and partially cutting the work material, and a pair of oscillating rollersbetween which the partial ly' out, work material is fed for completely severing same.

2. In an interioldin'g machine, the com bination of means foradvancing and partial: ly severing ,the work 'material at regular intervals, and a pair of oscillating rollers between which said partially severed material is fed for completely severing the same.

3. In an interfolding machine, thecombi nation of means for advancing and partially severing :two sheets of the work 'material, means for, advancing said sheets in juxtaosition and a' pair of oscillating rollers etween which said'juxtaposed sheets are fed for completely severing same.

4. In an interfolding machine, the combination of means for advancingqand partially severing two sheets "of the Work material at regular intervals, means 'for bringing said a rtially cut. sheets-in juxtaposition and a pair'of oscillating rollers between, which said juxtaposed' sheets are fed, for completely severing same.

H 5. In aninterfolding machine, the combination of means for simultaneously advancing and partially severing two sheets of the Work materialf neans, for advancing said partially severed sheets in-juxtaposig tion, said juxtaposed sheetseach having theirlpartially severed portions. positioned midway 1 between the corresponding partial'ly, severed portions of the adjacent sheet, and mechanism alternately, completely severingsaid advancing sheets at their extreme forward partially severedportions and continuingthe advance of the-conr pletely severed portions in overlappingj uxtaposed relation iforvthe purposedescribed.

6. In an interfoldingqmachine, the-"combination of means for advancing and partially severing the work material, two pairs of rollers between whichthe partiallyse vered material is fed in turn, and means operable "to'oscillate one of said p'airs-of rollers to completely sever the material;

7 'In an interfolding machine, the combination ofrmeans for-advancing and partially severing the work material, two pairs of rollersbetween whichthe: partiallysevered material is fed in turn, and means operable to oscillateone of said pairsoif'rollers in the path of the material to completely sever thematerial.

8. In' an interfolding' machine,-1neans for advancing and partially severing two sheets of work 'material, 'two pairs of rollers between which said partially severed sheets are fed in juxtaposed relation with the par-] fiiallyjsevered portions of one sheet .positioned midway betweenthe partially'severed portions. otthe. othen sheet, both of .said pairsofr01lers rotatable to advance the. ma-

terial at thesamcirate, and meansoperable to oscillate one pair'of the rollers in the :'Whi'ch= said partially severed"juxtaposed path of said-material to alternatelyoom pletely, sever partially severed portions;

9. In a machine of the. kindrdescribe d', means for uniformly advancing and partially severing two" separate slieets'of- :vvorkina terial, vvmeans advancing said partially severed sheetsin juxtaposed relation withithe partially severed sections ofone sheetmid way between the partially "severed sections of the oothersheet and a pair ofrollersbe- 1 tween which ,said partially severed juxtaposed sheets are fed, said rollers oscillating togetner in the path of'said sheets for alternately completely j severing each-ofsaid sheets at 'a partially severed section between said advancing means. and rollers:-

lO-uln a machine of the kind described, means'ior uniformly advancing and-partially severing two separatesheets'ofwork material, means advancing said" partially severed; sheets in uXtaposed' relationwith the partially: severed-sections of one' sheetmidway between the: partially severed: sections of the-other sheet-and 'a pair oiirollers between which-said partially severed juxtaposed sheets are fed, said rollers oscillating together. in. the path of s'aid sheets for alternately" completely severi-ng each of- I 'said sheetsat a partially severed-section bet-Ween said advancing means and rollers' said rollers alternately discharging the most advanced' completely severed "portion =of= each sheet into a mechanism-foldingsaid sheets alonga transverse median line to form a book oftwo-lea-ves.--

11; "In a machine of the kind described, means for uniformlyiadvancing and partially severing" two separate sheets of work material, means advancingsaid partially severed sheets in 'ju'xtaposedrelation with the partially severed "sections of one sheet mid- Way between the partially severed seetions'of the other -sheet'and-a pair o'f'rollers between 'which said partially severed juxtaposed SheetsatapartiaIly severed seetion between said advancin'g'means and rollers, said ro'llers'v alternately discharging-the most ad-1 'vanced completely severed-portion of each sheet into operative engagement with foldv "ing mechanism, said mechanism in turn folding fthe most advanced of each completely severed portion alonga transverse median 110 line toioim'a book of. two leaves.

12. In a machine of the-kind described, means for uniformly advancing andp'artially severing two separate sheets of, work material, meansradvancing said-partially sev (cred sheets in juxtaposed relationwithrthe partially severed sections of one sheet mid- Way between the partially 'severed'zsectionsr of the other sheet and a pair ofrollers "between sheets are fed, said rollers oscillating together in the path-of said sheets for alternately completely severing each of said sheets at a partially severed section between said advancing means and rollers, said rollers alternately discharging the most advanced completely severed portion of each sheet into operative engagement with a folding mechanism, said mechanism in turn folding the most advanced of each completely severed portion along a transverse median line to form a book of two leaves, the severed portions of one sheet being folded oppositely to the severed portions of i the other sheet whereby the leaves of each book are positioned between the leaves of adjacent books.

l8.v In a machine of the kind described, means for uniformly advancing and partially reversing two separate sheets of work material, a pair of feed rollers positioned in advance of said means between which said sheets are fed in juxtaposed relation with the partially severed sections of one sheet midway between the partially severed sections of the other sheet, a second pair of feed rollers between which said partially fed sheets are fed, said second pair of rollers being spaced in advance of the first '30 mentioned pair of rollers a distance greater than the distance between the partially severed sections of one strip, said second pair of rollers oscillating in the path of said sheets to alternately sever the same between said pairs of rollers.

In witness whereof, I hereunto subscribe my name this 14th day of Jan. A. D., 1930.

LOUIS A. STRAUBEL. 

